[tz] More than 2 transitions per year for Asia/Gaza & Hebron in 2068+

[Dave Rolsky]

Oops, you are right. The weirdness starts in 2072:

Asia/Hebron  Fri Mar 25 23:59:59 2072 UT = Sat Mar 26 01:59:59 2072 EET
isdst=0 gmtoff=7200
Asia/Hebron  Sat Mar 26 00:00:00 2072 UT = Sat Mar 26 03:00:00 2072 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Sep  9 22:59:59 2072 UT = Sat Sep 10 01:59:59 2072 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Sep  9 23:00:00 2072 UT = Sat Sep 10 01:00:00 2072 EET
isdst=0 gmtoff=7200
Asia/Hebron  Fri Oct 14 23:59:59 2072 UT = Sat Oct 15 01:59:59 2072 EET
isdst=0 gmtoff=7200
Asia/Hebron  Sat Oct 15 00:00:00 2072 UT = Sat Oct 15 03:00:00 2072 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Oct 28 22:59:59 2072 UT = Sat Oct 29 01:59:59 2072 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Oct 28 23:00:00 2072 UT = Sat Oct 29 01:00:00 2072 EET
isdst=0 gmtoff=7200
Asia/Hebron  Fri Mar 24 23:59:59 2073 UT = Sat Mar 25 01:59:59 2073 EET
isdst=0 gmtoff=7200
Asia/Hebron  Sat Mar 25 00:00:00 2073 UT = Sat Mar 25 03:00:00 2073 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Sep  1 22:59:59 2073 UT = Sat Sep  2 01:59:59 2073 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Sep  1 23:00:00 2073 UT = Sat Sep  2 01:00:00 2073 EET
isdst=0 gmtoff=7200
Asia/Hebron  Fri Oct  6 23:59:59 2073 UT = Sat Oct  7 01:59:59 2073 EET
isdst=0 gmtoff=7200
Asia/Hebron  Sat Oct  7 00:00:00 2073 UT = Sat Oct  7 03:00:00 2073 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Oct 27 22:59:59 2073 UT = Sat Oct 28 01:59:59 2073 EEST
isdst=1 gmtoff=10800
Asia/Hebron  Fri Oct 27 23:00:00 2073 UT = Sat Oct 28 01:00:00 2073 EET
isdst=0 gmtoff=7200


By my reading, that's 4 transitions per year.

Cheers,

Dave Rolsky
http://blog.urth.org
https://github.com/autarch


On Sat, Dec 30, 2023 at 2:08 PM Dave Rolsky <autarch at urth.org> wrote:

> Hi all,
>
> With the latest release (2023d) I'm seeing some surprising output from
> zdump for the Asia/Gaza & Asia/Hebron zones:
>
> $> zdump -v Asia/Hebron
> ...
> Asia/Hebron  Fri Mar 23 23:59:59 2068 UT = Sat Mar 24 01:59:59 2068 EET
> isdst=0 gmtoff=7200
> Asia/Hebron  Sat Mar 24 00:00:00 2068 UT = Sat Mar 24 03:00:00 2068 EEST
> isdst=1 gmtoff=10800
> Asia/Hebron  Fri Oct 19 22:59:59 2068 UT = Sat Oct 20 01:59:59 2068 EEST
> isdst=1 gmtoff=10800
> Asia/Hebron  Fri Oct 19 23:00:00 2068 UT = Sat Oct 20 01:00:00 2068 EET
> isdst=0 gmtoff=7200
> Asia/Hebron  Fri Mar 29 23:59:59 2069 UT = Sat Mar 30 01:59:59 2069 EET
> isdst=0 gmtoff=7200
> Asia/Hebron  Sat Mar 30 00:00:00 2069 UT = Sat Mar 30 03:00:00 2069 EEST
> isdst=1 gmtoff=10800
> Asia/Hebron  Fri Oct 11 22:59:59 2069 UT = Sat Oct 12 01:59:59 2069 EEST
> isdst=1 gmtoff=10800
> Asia/Hebron  Fri Oct 11 23:00:00 2069 UT = Sat Oct 12 01:00:00 2069 EET
> isdst=0 gmtoff=7200
>
>
> This pattern of >2 transitions per year continues from that year.
>
> Is this correct? It seems awfully weird.
>
>
> Cheers,
>
> Dave Rolsky
> http://blog.urth.org
> https://github.com/autarch
>
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